A. 17th Parallel Line
B. 24th Parallel Line
C. 38th Parallel Line
D. 49th Parallel Line
Correct Answer: D. 49th Parallel Line
The treaty established the 49th parallel from the Rocky Mountains to the Strait of Georgia as the boundary between the United States and British Canada. The 49th parallel north forms a border between the Canadian provinces of British Columbia, Alberta, Saskatchewan, and Manitoba and the U.S. states of Washington, Idaho, Montana, North Dakota, and Minnesota . Canada–United States border is the longest international border in the world between two countries.